Configuring precoders and combiners is a major

challenge to deploy practical multiple-input multiple-output

(MIMO) millimeter wave (mmWave) communication systems

with large antenna arrays. Most prior work addresses the problem

focusing on a total transmit power constraint. In practical

transmitters, however, power amplifiers must operate within their

linear range, so that a power constraint applies to each one

of the input signals to these devices. Therefore, precoder and

combiner designs should incorporate per-antenna or per-radio

frequency (RF) chain transmit power constraints. We focus on

such problem for frequency-selective channels with multicarrier

modulation, and assuming hybrid analog/digital architectures

based on fully connected analog blocks implemented with finite resolution

phase shifters. We first derive an all-digital solution

which aims to maximize spectral efficiency. Then, we develop

hybrid precoders and combiners by approximately matching

the corresponding all-digital matrices while still enforcing the

power constraints. Numerical results show that the proposed

all-digital design performs close to the upper bound given

by the standard waterfilling-based solution with a total power

constraint. Additionally, the hybrid designs exhibit a moderate

loss even when low-resolution phase shifters are considered.

%B IEEE Trans. Wireless Communications
%G eng
%R 10.1109/TWC.2022.3142959
%0 Conference Paper
%B VI Jornadas Nacionales de Investigación en Ciberseguridad (JNIC)
%D 2021
%T Homomorphic SVM Inference for Fraud Detection
%A Adrián Vázquez-Saavedra
%A Gonzalo Jiménez-Balsa
%A Jaime Loureiro-Acuña
%A Manuel Fernández-Veiga
%A Alberto Pedrouzo-Ulloa
%B VI Jornadas Nacionales de Investigación en Ciberseguridad (JNIC)
%I Ediciones de la Universidad de Castilla-La Mancha
%G eng
%1 JNIC 2021 Best Short Paper Award

%0 Journal Article %J Frontiers in Space Technologies %D 2021 %T A Hybrid Beamforming Design for Massive MIMO LEO Satellite Communications %A Joan Palacios %A Nuria González-Prelcic %A Carlos Mosquera %A Takayuki Shimizu %A Chang-Heng Wang %B Frontiers in Space Technologies %V 2 %G eng %U https://www.frontiersin.org/articles/10.3389/frspt.2021.696464/full %R 10.3389/frspt.2021.696464 %0 Thesis %D 2019 %T Homomorphic Lattice Cryptosystems for Secure Signal Processing %A Alberto Pedrouzo-Ulloa %I University of Vigo %C Vigo %G eng %0 Journal Article %J IEEE Access %D 2016 %T Hybrid MIMO Architectures for Millimeter Wave Communications: Phase Shifters or Switches? %A Mendez-Rial, Roi %A Rusu, Cristian %A Nuria González-Prelcic %A Alkhateeb, A. %A Heath Jr, Robert W. %B IEEE Access %V 4 %P 247-267 %8 January, 2016 %G eng %U http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7370753 %R 10.1109/ACCESS.2015.2514261 %0 Conference Paper %B IEEE Global Telecommunications Conf. (GLOBECOM) %D 2016 %T Hybrid precoders and combiners for mmWave MIMO systems with per-antenna power constraints %A R. López-Valcarce %A Nuria González-Prelcic %A Cristian Rusu %A R. W. Heath, Jr %K compass %K mmWave %XThis paper considers the design of hybrid precoders

and combiners for mmWave MIMO systems with per-antenna

power constraints and the additional limitations introduced by

the phase-shifting network in the analog processing stage. Previous

hybrid designs were obtained using a total power constraint,

but in practical implementations per-antenna constraints are

more realistic, specially at mmWave, given the large number of

power amplifiers used in the transmit array. Assuming perfect

channel knowledge, we obtain first an approximation to the alldigital

solution for the precoder and the combiner given the

per-antenna constraints. Then, we develop a new method for the

design of the hybrid precoder and combiner which attempts to

match such all-digital approximation. Simulation results show

the effectiveness of the proposed approach, which performs close

to the all-digital solution.

%B IEEE Global Telecommunications Conf. (GLOBECOM)
%G eng
%0 Conference Paper
%B IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM)
%D 2014
%T How to Implement Doubly-Stochastic Matrices for Consensus-Based Distributed Algorithms
%A S. Valcárcel-Macua
%A C. Moreno-León
%A J. S. Romero
%A Silvana Silva Pereira
%A Javier Zazo
%A Alba Pagès-Zamora
%A R. López-Valcarce
%A S. Zazo
%K compass
%K dynacs
%K wsn
%X Doubly-stochastic matrices are usually required by

consensus-based distributed algorithms. We propose a simple

and efficient protocol and present some guidelines for implementing

doubly-stochastic combination matrices even in noisy,

asynchronous and changing topology scenarios. The proposed

ideas are validated with the deployment of a wireless sensor

network, in which nodes run a distributed algorithm for robust

estimation in the presence of nodes with faulty sensors.

%B IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM)
%C A Coruña, Spain
%G eng
%R 10.1109/SAM.2014.6882409
%0 Conference Paper
%B IEEE GLOBECOM
%D 2011
%T Hybrid Space-Ground Processing for High-Capacity Multi-beam Satellite Systems
%A Arnau, Jesus
%A Michael Bergmann
%A Enzo Alberto Candreva
%A Giovanni Emanuele Corazza
%A Riccardo {De Gaudenzi}
%A Bertrand Devillers
%A Wilfried Gappmair
%A Francesco Lombardo
%A C. Mosquera
%A Ana Pérez-Neira
%A Ilaria Thibault
%A Alessandro Vanelli-Coralli
%B IEEE GLOBECOM
%C Houston, Texas, USA
%8 dec
%G eng
%0 Journal Article
%J EURASIP Journal on Information Security
%D 2009
%T High-rate data-hiding robust to linear filtering for colored hosts
%A Scagliola, Michele
%A Fernando Pérez-González
%A Guccione, Pietro
%K data-hiding
%K rational dither modulation
%K watermarking
%B EURASIP Journal on Information Security
%G eng
%0 Conference Paper
%B Security, Steganography, and Watermarking of Multimedia Contents
%D 2006
%T High-rate quantization data hiding robust to arbitrary linear filtering attacks
%A Fernando Pérez-González
%A C. Mosquera
%A Marcos Álvarez-Díaz
%A Reginald Lagendijk
%E Edward J. Delp
%E Ping W. Wong
%K data-hiding
%K watermarking
%B Security, Steganography, and Watermarking of Multimedia Contents
%S Proc. of SPIE
%I SPIE
%C San Jose, California, USA
%V 5306
%P 592-601
%8 January
%G eng
%0 Conference Paper
%B Security and Watermarking of Multimedia Contents
%D 2003
%T Hexagonal Quantizers are not Optimal for 2-D Data Hiding
%A Félix Balado
%A Fernando Pérez-González
%E Ping W. Wong
%E Edward J. Delp
%K data-hiding
%K watermarking
%B Security and Watermarking of Multimedia Contents
%S Proc. of SPIE
%C Santa Clara, USA
%V 5020
%8 jan
%G eng
%0 Journal Article
%J IEEE Transactions on Signal Processing
%D 1999
%T Hyperstable adaptive IIR algorithms with polyphase structures: analysis and design
%A R. López-Valcarce
%A C. Mosquera
%A Fernando Pérez-González
%K adaptive IIR filters
%K system identification
%B IEEE Transactions on Signal Processing
%V 47
%P 2043–2046
%8 July
%G eng
%0 Conference Paper
%B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
%D 1999
%T Hyperstable polyphase adaptive IIR filters
%A C. Mosquera
%A Fernando Pérez-González
%A R. López-Valcarce
%K adaptive IIR filters
%K system identification
%B IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
%C Phoenix, AZ, USA
%V 4
%P 1841–1844
%G eng